Tool-rest for turning-lathes.



No. 839,752. PATENTED DEC. 25, 1906r C. T. GUENZLER.

TOOL REST POR TURNING LATHES.

APPLICATION FILED JAN. 2, 1906.

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UNITE STATES `PATENT TWICE.

CHARLES T. GUENZLER, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO EDWIN KESSELRING, OF DETROIT, MICHIGAN.

TOOL-REST FOR TURNING-LATHES.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Appiimion med tammy 2, 1906. semi No. 294.038.

To {LZ/f whom, it nuty concern:

Be it known that I, CHARLES T. GUENZLER, a'subject of the King of Great Britain, residing at Detroit, in the county of IVayne and State of Michigan, have invented certain new and useful Improvements in Tool-Rests for Turning-Lathes, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in tool-rests for turning-lathes, and more especially to an improved tool-holder and guide-rest for wood-turning lathes, the object of the invention being to provide a very simple and cheap device for holding and guiding the tool which is so constructed that an inexperienced person by its use is enabled to do more and better work than an experienced person can do without the use of a guide or holder, the construction being such that the guide may be quickly and easily adjusted in any direction to conform to the work to be done or may be detached and replaced by another having a different form, said guide being also adapted to receive and detachably hold a very convenient and inexpensive tool-holder, a number of which holders may be provided for the different tools, thus enabling the operator to change tools as readily as though no toolholder was used.

A further object of the invention is to provide the device with certain other new and useful features, all as hereinafter more fully described, reference being had to the accompanying drawings, in which- Figure l is a perspective view of a device embodying the invention and showing the same as attached to a lathe-bed- Fig. 2 is a longitudinal vertical section through one of the supporting or securing arms and its supporting-post and also shows the tool-holder detached and n transverse section, and E ig. 3 is a perspective view of the tool-holder.

As shown in the drawings, I represents the lathe-bed, in which is formed a longitudinal slot 2 to receive bolts 8 for detachably and adjustably securing the supporting-arms 4 to the bed, said arms being each provided with a longitudinal slot 5, through which the bolt 3 passes. Upon the outer or free end of each of said arms is an upwardly-extending hollow post 6, forming a socket to receive the shank 7 of a vertically-adjustable member 8, which is formed with a head having a transverse slot 9, extending downward therein from its upper end to receive a downwardly-extending ange or rib 10 on the under side of the longitudinally-extending guide-bar Il. A set-screw 12, extending through one side of each head, engages the iiange and detachably secures the guide-bar to these vertically-adjustable members, and set-screws 13, extending through the sides of the hollow posts, engage the Shanks of said members and hold the same in any position to which they may be ad ,usted either vertically or rotatively.

In the upper side of the guide-bar is formed a longitudinal groove 14 to receive the toolholder 16, and the sides of the bar and the bottom of the groove are formed of an inclination to a horizontal plane, so that the tool -holder will be tipped or canted over when in the groove to hold the tool at an irrclination with its point higher than its handle portion.

The tool-holder consists of an upper and a lower clamping-block, the upper block 17 being provided with an upwardly-extending handle 18 and secured to the lower block 19 by screws or bolts 20, which when turned in draw the blocks toward each other to clamp the blade of the tool or chisel 2l between them within a transverse slot 22, cut in the upper side of the lower block. This slot is of less depth than the thickness of the blade, so that the upper block will come in contact with the blade to clamp the same before said block contacts the lower block at its ends. The rear edge 23 of the lower block is inclined to form a sharp angle at the lower corner to engage the undercut lower edge 24 of the groove 14 in the guide-bar. The upper edge 25 of this groove is inclined inward or in the same direction as the lower side, and the corresponding upper edge 26 of the block 19 is rounded so that the holder may be readily inserted in or lifted out of the groove at any point, but will be held from lifting directly upward and will be guided by the said engagement of the block with the undercut side of the groove. In order to lift the holder from the groove, it is first tilted toward the operator, and as the natural pressure of the hand on the handle is away from the operator the holder is very easily and naturally held in the groove and moved along therein and at the same time is readily removable.

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By providing a separate holder for each tool to be used a number of tools may be employed as readily as though no holder was used, and the manner in which the holder engages the groove permits the operator to raise or lower the point of his tool at Will.

The manner in which the supporting-arms 4 are secured to the lathe-bed permits ofthe ready adjustment of the guide-bar toward or from the work, and as the shanks of the supporting members may be turned .in their socket-posts one end only of the bar may be adjusted toward or from the work for turning a tapering column or other article.

In practice it is found that the tool will cut better if it engages the work just above a horizontal plane extending through the axis thereof, and therefore in turning a taper column it is desirable to raise one end of the guide-bar slightly higher than the other. This adjustment is accomplished by raising one of the members 8 in its socket and securing it in vthat position by the set-screw 13. The entire bar may of course be raised or lowered in the same manner.

Work having an irregular outline, as a column having a swell, may be turned by removing the straight guide-bar and putting one in its place having a groove which is properly curved to guide the tool in the desired manner, a number of such bars of different lengths, &c., being provided for the different kinds and sizes of work.

Having thus fully described my invention, what I claim isl. The combination of an adjustable guidebar adapted to be adjusted vertically and horizontally and having a longitudinal groove in its upper face slanting inwardly on one side and undercut on its opposite side, a tool-holder of a width to iit within the groove and formed with a projecting edge to engage the undercut side of the groove and a slanting edge to engage the slanting side, and a handle on said holder.

2. The combination of a guide-bar having a longitudinal groove in its upper side and adapted to be adjusted vertically and horizontally at either or both ends, a tool-holder consisting oftwo clamping-blocks the lower one of which is formed to iit the groove, clamping-screws to secure the blocks together and clamp the tool between, and

means for detachably holding the holder in the groove.

3. In a tool-holder and guide-rest for turning-lathes, the combination of supportingarms eachadapted to be detachably and adjustably secured to a lathe-bed, a vertically adjustable and rotatable member on each of said arms, a guide-bar detachably secured to the upper ends of said members, a toolholder, and means for engaging and detachably holding the holder in the bar and guiding the same longitudinally thereof.

4. In a tool-holder and guide-rest for wood-turning lathes, the combination of supporting-arms adapted to be detachably secured to a lathe-bed and to be adjusted horizontally, hollow posts on the ends of said arms, supporting members vertically and rotatively adjustable on said posts, a guide-bar detachably secured to said members and formed with an upper side extending at an angle to a horizontal plane and formed witha groove having an undercut side, a tool-holder consisting of two clamping-blocks the lower one of which is formed to it within the groove and provided With a projecting edge to engage the undercut side, an upwardly-eX- tending handle on the upper block, and clamping-screws to secure the blocks together with the tool between.

5. In a tool-holder and guide-rest for wood-turning lathes, the combination of supporting-arms each provided with a longitudinal slot to receive a bolt for detachably and adj ustably securing the arm to the lathe-bed, an upwardly-extending hollow post on the outer end of each arm, supporting members each consisting of a cylindrical shank portion to fit within the post and a head having a slot extending inward from its upper end, set-screws to hold the Shanks in their adjusted positions in the posts, a guide-bar provided with a downwardlyextending rib on its lower side to fit in the slots in the heads and formed with a horizontal groove in its upper side having an undercut side and an inwardly-slanting side, set-screws to detachably hold the rib in the slots, a tool-holder consisting of two clamping-blocks, the lower one of which is formed to fit Within the groove and provided with a transverse slot to receive the tool, a handle on the upper block, and set-screws to secure the blocks together.

In testimony whereof I afIiX my signature in presence of two witnesses.

CHARLES T. GUENZLER.

Witnesses:

EDWIN KEssELRrNG, OTTO F. BARTHEL.

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